Q: Vent blowing issues

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I have a 2003 Chevy trailblazer loaded. My battery recently died so I bought a new one. But once I replaced it, my car ran fine. But my heat, and a/c blows, but it's a very little blow. Why doesn't my vents blow hard like they used to before my battery died? I already pulled and done steps with the Hvac fuse #36. That didn't work either.

My car has 100000 miles.
My car has an automatic transmission.

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